Does nature do it better?

This week we're looking to nature to solve some of today's biggest problems - from climate change to water shortages. We hear how spiders hold the key to making the strongest material known to man and how insect ears have inspired the world's smallest microphone. Plus, why Bruce Willis might be making you fat, the Arctic ice sheets that are melting despite headlines to the contrary, and why thousands of languages are on the brink of extinction...